I'd like to have a name for the union that's bit more context related, not related to the underlying theory. 
If we define the union here once, we even don't need a dedicated name for the union:
```c
union {
   u_int8 b[4];
   u_int16 w[2];
   u_int32 dw;
} u;
```
`u` can then be used below.